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 TM 55-1905-219-14-9
4-34. THERMAL EXPANSION VALVE - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS
(Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
d. Make the
cage fit
properly
before
tightening
body
flange.
2. Install bulb
f.
Screws
Install
(1)
REMOVAL/INSTALLATION
3.
Remove valve in accord-
ance with procedure in
NOTE
Be sure to install the thermal expansion valve so that the flow of refrigerant is in the direction
indicated by the arrow on valve body.
ADJUSTMENT
4.
a. The thermal expansion valves are factory set to
maintain the suction gas leaving evaporator at 8
to -10 (13.3 to -23.3 ) superheat.
F
C
b. To adjust superheat setting remove seal cap on side
of valve and turn adjusting stem. Turning stem to
right decreases refrigerant flow and raises super-
heat.
c.
Turning stem to left increases refrigerant flow and
lowers superheat. Two turns of stem will change
superheat about 1 (-17.2 ). Adjust two turns
F
C
at a time.
d. Adjust each expansion valve separately and wait
between adjustments to observe results. Always
tighten any loose connections and replace seal cap
after adjustments.
4-950
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